XRT72L50 Datasheet, PDF (440/471 Pages) Exar Corporation – SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER WITH HDLC CONTROLLER
REV. 1.2.1
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FIGURE 192. ILLUSTRATION OF THE SIGNALS THAT ARE OUTPUT VIA THE RECEIVE OVERHEAD OUTPUT INTERFACE
(FOR METHOD 1).
RxOHClk
RxOHFrame
RxOH
FA1, Bit 7
FA1, Bit 6
FA1, Bit 5
FA1, Bit 4
FA1, Bit 3
Terminal Equipment should sample
the “RxOHFrame” and “RxOH” signals
here.
Recommended Sampling Edges
6.3.4.2 Method 2 - Using RxOutClk and the RxOHEnable signals
Method 1 requires that the Terminal Equipment be able to handle an additional clock signal, RxOHClk.
However, there may be a situation in which the Terminal Equipment circuitry does not have the means to deal
with this extra clock signal, in order to use the Receive Overhead Data Output Interface. Method 2 involves the
use of the following signals.
• RxOH
• RxOutClk
• RxOHEnable
• RxOHFrame
Each of these signals are listed and described in Table 86.
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